Theory

Preface This section introduces the principles of six-step control. The open-loop part is relatively simple, and most issues typically occur on the feedback side. For sensorless feedback, we will refer to documentation from ST and NXP to provide detailed explanations. This will help clarify the debugging process and save development time. The coding structure will […]

Preface The State Observer Sensorless Algorithm is the method used by ST’s SDK. Here, we will delve into the Observer + PLL algorithm to correspond with the parameters that need to be adjusted in the ST MCSDK, enabling faster and more accurate completion of tasks. The reference material is ST MCSDK version 6.3.0.Among the various

Preface Here, for design reference, a detailed exploration of single-shunt and three-shunt configurations is conducted. This article will delve into the differences between these two configurations and the variances between the old and new versions of MCSDK. It is recommended to use MCSDK 5.x version for verification, as it provides a better UI interface for

Preface A current sensing resistor (shunt resistor) is usually placed on one of the three-phase lines. The voltage drop across this resistor can be amplified by an operational amplifier (op-amp), and then received by a sensor and converted into a digital signal. In this way, we can detect the current of the motor in the

Preface After discussing all the mathematical transformations, we come to the final step of FOC control. First, let’s take a look at the Three Phase Inverter shown in the diagram below, which is generally included in the motor driver. The green box typically represents the MCU control calculation. The final complete FOC algorithm The physical

Preface In the previous section, we discussed the decomposition of feedback signals. In this section, we will delve into the introduction of input signals. PWM to SPWM We need to drive a three-phase inverter circuit, and if we use only switching, we will get a control signal similar to a 6-step square wave, which is

Preface In the previous chapter, we introduced the types of motors and briefly described their control methods. In this chapter, we will delve into the mathematical model and FOC control method in depth Control state Here you can refer to the dynamic diagram of the left image, where it can be seen that different current

Preface We will be discussing the ‘Y-type winding brushless DC motor’, and will explain the motor type, principle of rotation, control methods, theoretical control, and step-by-step implementation. are shown in the following figure. Principle of Motor Rotation The two circular magnets in the figure below will rotate due to the rotation of the upper magnet,